<template>
  <div class="app-container">
    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="searchObj.username" placeholder="用户名" />
      </el-form-item>
      <el-button type="primary" icon="el-icon-search" @click="fetchData()"
        >查询</el-button
      >
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>
    <!-- 工具条 -->
    <div>
      <el-button
        type="danger"
        size="mini"
        @click="addUser()"
        v-if="hasPerm('user.add')"
        >添加</el-button
      >
      <el-button
        type="danger"
        size="mini"
        @click="removeRows()"
        v-if="hasPerm('user.remove')"
        >批量删除</el-button
      >
    </div>
    <!-- 讲师列表 -->
    <el-table
      v-loading="listLoading"
      :data="list"
      stripe
      style="width: 100%"
      @selection-change="handleSelectionChange"
    >
      <el-table-column type="selection" width="55" />
      <el-table-column label="序号" width="70" align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>
      <el-table-column prop="username" label="用户名" width="150" />
      <el-table-column prop="nickName" label="用户昵称" />
      <el-table-column prop="gmtCreate" label="创建时间" width="180" />
      <el-table-column label="操作" width="230" align="center">
        <template slot-scope="scope">
          <router-link :to="'/acl/user/role/' + scope.row.id">
            <el-button
              type="info"
              size="mini"
              icon="el-icon-info"
              v-if="hasPerm('user.assgin')"
            ></el-button>
          </router-link>
          <router-link :to="'/acl/user/update/' + scope.row.id">
            <el-button
              type="primary"
              size="mini"
              icon="el-icon-edit"
              v-if="hasPerm('user.update')"
            ></el-button>
          </router-link>
          <el-button
            type="danger"
            size="mini"
            icon="el-icon-delete"
            @click="removeDataById(scope.row.id)"
            v-if="hasPerm('user.remove')"
          ></el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页组件 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[5, 10, 20, 30, 40, 50, 100]"
      style="padding: 30px 0; text-align: center"
      layout="sizes, prev, pager, next, jumper, ->, total, slot"
      @current-change="fetchData"
      @size-change="changeSize"
    />
  </div>
</template>
<script>
import user from '@/api/acl/user'
export default {
  data() {
    return {
      listLoading: true, // 数据是否正在加载
      list: null, // 讲师列表
      total: 0, // 数据库中的总记录数
      page: 1, // 默认页码
      limit: 10, // 每页记录数
      searchObj: {}, // 查询表单对象
      multipleSelection: [], // 批量选择中选择的记录列表
    }
  },
  // 生命周期函数：内存准备完毕，页面尚未渲染
  created() {
    this.fetchData()
  },
  // 生命周期函数：内存准备完毕，页面渲染成功
  mounted() {},
  methods: {
    // 当页码发生改变的时候
    changeSize(size) {
      console.log(size)
      this.limit = size
      this.fetchData(1)
    },
    addUser() {
      this.$router.push({ path: '/acl/user/add' })
    },
    // 加载讲师列表数据
    fetchData(page = 1) {
      // 异步获取远程数据（ajax）
      this.page = page
      user
        .getPageList(this.page, this.limit, this.searchObj)
        .then((response) => {
          this.list = response.data.items
          this.total = response.data.total
          // 数据加载并绑定成功
          this.listLoading = false
        })
    },
    // 重置查询表单
    resetData() {
      console.log('重置查询表单')
      this.searchObj = {}
      this.fetchData()
    },
    // 根据id删除数据
    removeDataById(id) {
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      })
        .then(() => {
          // promise
          // 点击确定，远程调用ajax
          return user.removeById(id)
        })
        .then((response) => {
          this.fetchData(this.page)
          if (response.success) {
            this.$message({
              type: 'success',
              message: '删除成功!',
            })
          }
        })
        .catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除',
          })
        })
    },
    // 当表格复选框选项发生变化的时候触发
    handleSelectionChange(selection) {
      console.log('handleSelectionChange......')
      console.log(selection)
      this.multipleSelection = selection
    },
    // 批量删除
    removeRows() {
      console.log('removeRows......')
      if (this.multipleSelection.length === 0) {
        this.$message({
          type: 'warning',
          message: '请选择要删除的记录!',
        })
        return
      }
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      })
        .then(() => {
          // promise
          // 点击确定，远程调用ajax
          // 遍历selection，将id取出放入id列表
          var idList = []
          this.multipleSelection.forEach((item) => {
            idList.push(item.id)
            // console.log(idList)
          })
          // 调用api
          return user.removeRows(idList)
        })
        .then((response) => {
          this.fetchData(this.page)
          if (response.success) {
            this.$message({
              type: 'success',
              message: '删除成功!',
            })
          }
        })
        .catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除',
          })
        })
    },
    // 执行搜索
    // queryString：文本框中输入的值
    // cb：一个函数
    querySearch(queryString, cb) {
      console.log(queryString)
      console.log(cb)
      // teacher.selectNameByKey(queryString).then(response => {
      //   // 调用 callback 返回建议列表的数据
      //   cb(response.data.items)
      // })
    },
  },
}
</script>